What is the most important influence on young adults

What is the most important influence on young adults?
I would generally agree with the statement that friends are the most
important influence on young adults. Certainly, I cannot ignore the
influence that family has on young people because the parents
determine their children`s` further behavior.
In my opinion, the most important influence on children is that
family has. But when kids leave their usual circle of influence such
as family because they become students they enter a new circle of
influence of their schoolmates. In turn, their schoolmates become
the most important influence on young adults until high school or
college.
When children become teenagers or young adults friends are those
who have not only the most important but also the strongest
influence on them. There are several reasons for that. First, many
teenagers leave home to study at a distant high school or college.
They have already broken connections with their families and
friends become the closest people around them. Second, the most
frequent social contacts young adults have are with their friends
which are usually at the same age. Therefore, teenagers share same
interests with their friends; they have same problems and what is
more they depend on each other for help or advice.
In addition, it is crucially important for an young adult to be a part of
the youth culture. In order to be accepted in the society teenagers
have to follow the same behavior models typical of their friends.
All of above mentioned forms my opinion that friends are the most
important influence on young peoples` further behavior. While some
people think that the family is the most substantial factor for
development of young adults I believe that friends have the most
powerful effect on young peoples` attitude to the other members of the
society and to the world as a whole. And sometimes that influence
may last forever.